yfastud,
I am new myself at Joomla. My new site will be the first using Joomla.
So I can't give a definitive answer to your question. I know that in the administrator panel of Joomla there is a user manager. I guess that this is the place where you create users and grant permissions. See the Joomla website and it's forum for more answers (http://www.joomla.org).
I hope you find the right answe
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